Buggy code:
public class DBWriter { protected static Category cat = Category . getInstance ( DBWriter . class ) ; String configFile = null ; String stmtString = "" ; Properties props = null ; static Connection Conn = null ; public DBWriter ( ) { } public boolean hasConnection ( ) { } private void errorMessage ( String msg , Exception e ) { } public void store ( MModel model ) { } private void store ( MModel model , Statement stmt ) throws SQLException { } private void store ( MNamespace ns , Statement stmt ) throws SQLException { } private void store ( MPackage me , Statement stmt ) throws SQLException { } private void store ( MModelElement me , Statement stmt ) throws SQLException { } private void store ( MConstraint me , Statement stmt ) throws SQLException { } private void store ( MClass cls , Statement stmt ) throws SQLException { } private void store ( MDataType cls , Statement stmt ) throws SQLException { } private void store ( MClassifier cls , Statement stmt ) throws SQLException { stmtString = "REPLACE<seq2seq4repair_space>INTO<seq2seq4repair_space>tClassifier<seq2seq4repair_space>(uuid)<seq2seq4repair_space>VALUES<seq2seq4repair_space>('" ; stmtString += ( cls . getUUID ( ) ) + "')" ; stmt . executeUpdate ( stmtString ) ; store ( ( ( MGeneralizableElement ) ( cls ) ) , stmt ) ; <START_BUG> Vector attributes = new Vector ( UmlHelper . getHelper ( ) . getCore ( ) . getAttributes ( cls ) ) ; <END_BUG> for ( int i = 0 ; i < ( attributes . size ( ) ) ; i ++ ) store ( ( ( MAttribute ) ( attributes . elementAt ( i ) ) ) , stmt ) ; Vector operations = new Vector ( UmlHelper . getHelper ( ) . getCore ( ) . getOperations ( cls ) ) ; for ( int i = 0 ; i < ( operations . size ( ) ) ; i ++ ) store ( ( ( MOperation ) ( operations . elementAt ( i ) ) ) , stmt ) ; } private void store ( MGeneralizableElement me , Statement stmt ) throws SQLException { } private void store ( MAssociation me , Statement stmt ) throws SQLException { } private void store ( MAssociationEnd me , Statement stmt ) throws SQLException { } private void store ( MGeneralization me , Statement stmt ) throws SQLException { } private void store ( MInterface me , Statement stmt ) throws SQLException { } private void store ( MUseCase me , Statement stmt ) throws SQLException { } private void store ( MActor me , Statement stmt ) throws SQLException { } private void store ( MDependency me , Statement stmt ) throws SQLException { } private void store ( MAbstraction me , Statement stmt ) throws SQLException { } private void store ( MStereotype me , Statement stmt ) throws SQLException { } private void store ( MAttribute me , Statement stmt ) throws SQLException { } private void store ( MStructuralFeature me , Statement stmt ) throws SQLException { } private void store ( MFeature me , Statement stmt ) throws SQLException { } private void store ( MOperation me , Statement stmt ) throws SQLException { } private void store ( MBehavioralFeature me , Statement stmt ) throws SQLException { } private void store ( MParameter me , Statement stmt ) throws SQLException { } public static void main ( String [ ] Args ) throws Exception { } }

Fix:
Vector attributes = new Vector ( UmlHelper . getHelper ( ) . getCore ( ) . getStructuralFeatures ( cls ) ) ;